package com.sky.service.impl;

import com.github.pagehelper.Constant;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.constant.StatusConstant;
import com.sky.controller.admin.DishController;
import com.sky.dto.DishDTO;
import com.sky.dto.DishPageQueryDTO;
import com.sky.entity.Dish;
import com.sky.entity.DishFlavor;
import com.sky.entity.Setmeal;
import com.sky.exception.DeletionNotAllowedException;
import com.sky.mapper.DishFlavorMapper;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealDishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.result.PageResult;
import com.sky.service.DishService;
import com.sky.vo.DishVO;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;

import java.util.ArrayList;
import java.util.Collections;
import java.util.List;
@Slf4j
@Service
public class dishServiceImpl implements DishService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private DishFlavorMapper dishFlavorMapper;
    @Autowired
    private SetmealDishMapper setmealDishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 新增菜品和对应口味
     *
     * @param dishDTO
     */
    @Transactional
    @Override
    public void savewithflavor(DishDTO dishDTO) {
        log.info("新增菜品，{}", dishDTO);
        //向菜品表插入单条数据
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.insert(dish);

        //获取insert语句生成的菜品id
        Long dishId = dish.getId();

        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(flavor -> {
                flavor.setDishId(dishId);
            });
            //向口味表插入多条数据
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    /**
     * 菜品分页查询
     * @param dishPageQueryDTO
     * @return
     */
    @Override
    @Transactional
    public PageResult pageQuery(DishPageQueryDTO dishPageQueryDTO) {
        PageHelper.startPage((dishPageQueryDTO.getPage()), dishPageQueryDTO.getPageSize());
        Page<DishVO> page =dishMapper.pageQuery(dishPageQueryDTO);
        return new PageResult(page.getTotal(), page);
    }

    /**
     * 批量删除菜品
     * @param ids
     */
    @Override
    public void deleteBatch(List<Long> ids) {
        //判断菜品状态，是否可以删除
        for (Long id : ids) {
            //查询菜品状态
            Dish dish =dishMapper.selectStatusById(id);
            //如果菜品处于起售状态，则不能删除（抛出异常，采用局部异常处理器）
            if(dish.getStatus()== StatusConstant.ENABLE){
                throw new DeletionNotAllowedException(MessageConstant.SETMEAL_ON_SALE);
            }
        }
        //判断是否关联套餐
        List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(ids);
        //如果关联了套餐，则不能删除（抛出异常，采用局部异常处理器）
        if(setmealIds!=null&&setmealIds.size()>0){
            throw new DeletionNotAllowedException(MessageConstant.DISH_BE_RELATED_BY_SETMEAL);
        }
        //删除菜品表中菜品数据
        // 使用for-each循环遍历ids集合中的每个id
        for (Long id : ids) {
            // 调用dishMapper的deleteById方法，根据id删除菜品数据
            dishMapper.deleteById(id);
            //删除菜品口味数据：调用dishFlavorMapper的deleteByDishId方法，根据菜品id删除对应的口味数据
            dishFlavorMapper.deleteByDishId(id);
        }

    }

    /**
     * 根据id查询菜品数据和口味数据
     * @param id
     * @return
     */
    @Override
    public DishVO getByIdWithFlavor(Long id) {
        //根据id查询菜品数据
        Dish dish =dishMapper.selectStatusById(id);
        //根据菜品id查询口味数据
        List<DishFlavor> flavors =dishFlavorMapper.getByDishId(id);
        //将查询到的结果封装到DishVO中并返回
        DishVO dishVO =new DishVO();
        BeanUtils.copyProperties(dish,dishVO);
        dishVO.setFlavors(flavors);
        return dishVO;
    }
    /**
     * 修改菜品和对应口味
     * @param dishDTO
     */
    @Override
    public void updateWithFlavor(DishDTO dishDTO) {
        //1、修改菜品表中的数据
        Dish dish = new Dish();
        BeanUtils.copyProperties(dishDTO, dish);
        dishMapper.update(dish);

        //2、删除菜品口味表的数据
        dishFlavorMapper.deleteByDishId(dishDTO.getId());
        //   修改菜品口味表的数据
        List<DishFlavor> flavors = dishDTO.getFlavors();
        if (flavors != null && flavors.size() > 0) {
            flavors.forEach(flavor -> {
                flavor.setDishId(dishDTO.getId());
            });
            dishFlavorMapper.insertBatch(flavors);
        }

    }

    @Override
    /**
     * 菜品起售停售
     *
     * @param status
     * @param id
     */
    @Transactional
    public void startOrStop(Integer status, Long id) {
        Dish dish = Dish.builder()
                .id(id)
                .status(status)
                .build();
        dishMapper.update(dish);

        if (status == StatusConstant.DISABLE) {
            // 如果是停售操作，还需要将包含当前菜品的套餐也停售
            List<Long> dishIds = new ArrayList<>();
            dishIds.add(id);
            // select setmeal_id from setmeal_dish where dish_id in (?,?,?)
            List<Long> setmealIds = setmealDishMapper.getSetmealIdsByDishIds(dishIds);
            if (setmealIds != null && setmealIds.size() > 0) {
                for (Long setmealId : setmealIds) {
                    Setmeal setmeal = Setmeal.builder()
                            .id(setmealId)
                            .status(StatusConstant.DISABLE)
                            .build();
                    setmealMapper.update(setmeal);
                }
            }
        }
    }
    /**
     * 动态条件查询菜品
     * @param categoryId
     * @return
     */
    @Override
    public List<Dish> list(Long categoryId) {
        Dish dish = Dish.builder()
                .categoryId(categoryId)
                .status(StatusConstant.ENABLE)
                .build();
        return dishMapper.list(dish);
    }

    /**
     * 条件查询菜品和口味
     * @param dish
     * @return
     */
    public List<DishVO> listWithFlavor(Dish dish) {
        List<Dish> dishList = dishMapper.list(dish);

        List<DishVO> dishVOList = new ArrayList<>();

        for (Dish d : dishList) {
            DishVO dishVO = new DishVO();
            BeanUtils.copyProperties(d,dishVO);

            //根据菜品id查询对应的口味
            List<DishFlavor> flavors = dishFlavorMapper.getByDishId(d.getId());

            dishVO.setFlavors(flavors);
            dishVOList.add(dishVO);
        }
        return dishVOList;
    }
}
